Milton



(No Model.)

- M. O. JONES.

Combined Low Water Detector and Gage Cock.

110,243,070. I Patentedjune 21,1881.

mmmmm N. PETERS Plmlhomplwr. Washington. DC.

UNITED STATES PATENT OFFICE.

MILTON O. JONES, OF TROY, NEW YORK.

COMBINED LOW-WATER DETECTER AND GAGE-COCK.

SPECIFICATION forming part of Letters Patent No. 243,070, dated June 21,1881. Application flied october 23, Isso. (No model.)

To all lwhom it may concern:

Be'itvknown that I, MILTON O. JONES, of Troy, in the county ofRensselaer and State of New York, have invented a new and usefulImprovement in Combined Low-W'ater Alarms and Gage-Cocks forSteam-Boilers, of which the following is a specification.

My invention consists in combining in a single appliance a low-wateralarm provided with a fusible metal plug, and a gage-cock provided withdoubleseated valve, the whole being constructed and arranged to operateas hereinafter described.

The accompanying drawing, which forms a part of this specification,shows a vertical section of my invention through the center linethereof, and, as therein illustrated, A is the valve-casing, which, withthe neck-piece A', forms a chamber containing the valve-seats a and a';B, the valve, provided with two bearing-faces arranged in oppositedirections, one being adapted to t into the seat a and the other intothe seat a. Said valve is also provided with the stem b, having ascrew-thread, b', formed thereon that lits into a counterpart thread inthe neck-piece A 5 C, a stuffing-box at the outer end ofthe neck-piece Afor forming a steam-tightjoint around the stem b; D, a hand-wheel fixedon the outer end of the stem b for operating the valve B E, a verticalmetallic tube secured to the top of the casing A, so as to form an opencommunication with the chamber of said casing. It is provided with adetachable head, F, containing a plug or disk, G, of fusible alloy thatis compounded to melt at a temperature of about 2120 Fahrenheit.

In attaching this device to a boiler itshould be placed on the line ofthe lowest water-level. The valve B, when drawn back against the seata', permits the water to flow into and fill the chamber of the casing Aand tube E, and so long as the water continues to fill these parts itwill serve as a protection for the fusible plug G and prevent it frombeing melted, and while this condition is maintained the device may beused as an ordinary gage-cock lfor testing the height of water in theboiler. To use it for that purpose the stem b must be turned to forcethe valve B clear from the seat a', when the water from the boiler willflow out through the opening in the nipple a2. Should the water in theboiler fall below the low-water line, the tubeE will become empty byreason ofthe greater gravity of the water as against steam, and thedevice will then be opened for the iniiow of steam from the boiler. Whenthis occurs the heat of the steam will melt the fusible plug G, therebyleaving the end of the tube open, permitting the steam to escape to givewarning of the danger. The valve Bv may then be closed against the seata., as indicated by the dotted lines in the drawing, to stop the iiow ofsteam from the boiler until a new fusible plug is inserted to restorethe device to a proper condition for performing its functions.

By closing the valve B against the seat a the tube E and head F, oreither of them, may be removed at any time for the purpose of making anexamination into the condition of those parts. l

I claim as myinvcntion- A combined low-water alarm and gage-cockconsisting of the valve casing A, provided with oppositeiy-arrangedvalve-seats a and a', the double-acting valve B, adapted to fit intosaid seats, so as to close one of them at a time, and afusible plug, G,connected to the metallic tube E, all constructed and arranged tooperate as specified.

MILTON o. JoNEs.

Witnesses:

EDWIN G. DAY, WILLIAM H. Low.

